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Finding the Third Proportional to 281,406 and 421,620

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Solution

The third proportional to 281,406 and 421,620 is: 631,697.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,406 : 421,620 = 421,620 : x
  2. Step 2: Convert to fraction form
    281,406/421,620 = 421,620/x
  3. Step 3: Cross multiply
    281,406x = 421,620 × 421,620
  4. Step 4: Simplify right side
    281,406x = 177,763,424,400
  5. Step 5: Solve for x
    x = 177,763,424,400/281,406
  6. Step 6: Final answer
    x = 631,697.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.